diff --git a/index.d.ts b/index.d.ts
index 061121acd..e190d9280 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -242,6 +242,53 @@ export interface ContentType {
     settings?: IEditorInterfaceOptions
   ): void
 
+ /**
+   * Changes the control of given field's ID.
+   *
+   * @param fieldId The ID of the field.
+   * @param widgetNamespace The namespace of the widget. Use 'builtin' for standard widgets,  'extension' for UI extensions or 'app' for installed apps.
+   * @param widgetId The new widget ID for the field.
+   * @param settings Widget settings
+   */
+  changeFieldControl(fieldId: string,
+    widgetNamespace: 'builtin',
+    widgetId:
+     | 'assetLinkEditor'
+     | 'assetLinksEditor'
+     | 'assetGalleryEditor'
+     | 'boolean'
+     | 'datePicker'
+     | 'entryLinkEditor'
+     | 'entryLinksEditor'
+     | 'entryCardEditor'
+     | 'entryCardsEditor'
+     | 'numberEditor'
+     | 'rating'
+     | 'locationEditor'
+     | 'objectEditor'
+     | 'urlEditor'
+     | 'slugEditor'
+     | 'listInput'
+     | 'checkbox'
+     | 'tagEditor'
+     | 'multipleLine'
+     | 'markdown'
+     | 'singleLine'
+     | 'dropdown'
+     | 'radio'
+     | 'richTextEditor',
+    settings?: IEditorInterfaceOptions): void;
+
+  /**
+  * Changes the control of given field's ID.
+  *
+  * @param fieldId The ID of the field.
+  * @param widgetNamespace The namespace of the widget. Use 'builtin' for standard widgets,  'extension' for UI extensions or 'app' for installed apps.
+  * @param widgetId The new widget ID for the field.
+  * @param settings Widget settings
+  */
+  changeFieldControl(fieldId: string, widgetNamespace: 'extension' | 'app', widgetId: string, settings?: IEditorInterfaceOptions): void;
+
   /**
    * Changes the control of given field's ID.
    *